Belt-tightening mechanism for motor-driven supply units



Nov. 18, 1930. H. DALTON ,782, BELT TIGHTENING MECHANISMFOR MOTOR DRIVENSUPPLY uiu'rs Original Filed J 6. 1922 v 2 Sheets$heet 1 nvvsuivn ATTORNE Nov. 18, 1930. H. DALTON 1,782,195

BELT TIGHTENING MECHANISM FOR MOTOR DRIVEN SUPPLY UNITS Original FiledJan. 16, 1922 2 Sheets-Sheet 2 ATTORNEY.

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UNI-TED] Patented, Nov. 18, 1930 HUBER-T nALToiLloF sraivinonn,ieounno'rioor 'BELT-TIGHTENING mnonnnisrr Fen oron-DRIVEN SUPPLY UNITSoriginal application filed January 16, 1922,-Seria1'No. 529,408. Dividedand this application filed January I A 9,1925; Serial No."1,335."

This application is a division of myapplication Serial No. 529,406,filed January I6, 1922, for motor driven power supply units (PatentNumber 1,5t4,377, June30, 1925).

5 This invention relates to an improved 1110- tor driven power supplyunit for lathes ,'drilling .or milling machines and similar machineswhich are-usuallyoperated in series byfpower supplied from .a commonoverhead countershaft.v It isthe purpose of my present;-im-,

provements to provide an individualjpower supply unit for each one ofsuch a series of machines so that any one machine in the series may bedisconnected from the common power 7 supply source and its operationcontinued by means of the individual motor driven power unit; Q 7 To theabove end my invention broadly comprehends a mechanism in constantconne'ction with the main operating spindle of the machine and the motordriven shafttd gether with means operable, at will for rendering suchmechanism effective' to drive the machine. spindle in. either direction,a

An additional feature of novelty consists in the provision of animproved .be t tight- 1 ening means tocoact with the stretches of anendless :belt connecting the counterrshaft with the machine spindlewhereby the proper 3 tension maybe maintained upon saidibelt.

a ,In general, I proposeto provide a motor driven power-supplyumt in theform of an I accessory or attachment, for various types of metalworking-machines Which consists of comparatively few parts effective andreliable in operation and not liable to get out of order, the attachmentbeing capable of manufacture at relatively small cost.

IVith the above and other objects in view, the invention consists in theimproved motor driven power supply unit and in the form, constructionand relative arrangement, of its several parts as will: be hereinaftermore fully described, illustrated in the accompany,- ing drawings andsubsequently incorporated in the subjoined claim. r In the drawingswherein I have iliustrated one practical and satisfactory embodiment ofasiapplied for use in connection with a .metal working machine,

Figure 2 illustrates a side elevation of the "upper part of the machine,and V V Figure 3 is a detail section taken on the line 33 of Figure 1.

In theaccompanying drawings, for the purpose of showing themannerofapplication and use of the present'invention, I have illustrated thesame associated with a metalworking machine.- However, I have shown onlyso muchof thelatter as 1s necessary to a clear ley 8. In largeit'actories,;a series of such machines areithus operated from the samecounter-shaft, thepojwer for'which is usually supplied by ajsteamedriven engine. Frequently, the driving-belts break so that one ormore of the machines must be "idle until the belt is, repaired or a newbelt supplied.

For various other reasons, as for instance owing to a temporary dimnution of the power supply, it may become necessary-to disconnect oneormore of the machines from the cou'ntenshaft, In order to obviate theloss incident to such temporary idleness of the machines,I propose toprovide an auxil counter-shaft 18 of this transmissionmech one end of apower transmittingmechanism fully described in my prior application, ofwhich this application is a division. The

anism is provided with a stepped pulley 54 wh1ch1s-keycd or otherwiserigidly fixed thereto and is connected by means of the driv 3 each otherin a supporting frame 58. A

bracket 59 is fixed to. one side of the machine head 7 and is providedin 1ts upper surface with a groove or channel in which a dove-tail rib60 on the bottom face of the frame 58 has sliding engagement. This ribis provided with a longitudinally extending rack 61 which is engaged byteeth 62 cut on the inner end of a shaft 63 mounted in the bracket 59. Asuitable operating handle 64: may be applied to the other end of thisshaft. From reference'to Figure'l of the drawings it will be apparentthat upon rotating shaft 63 in the proper direction, the frame 58carrying the guide rollers 56 and 57 maybe moved outwardly to take upslack in the belt and apply the proper tension thereto.

Between one side of the dove-tail rib and the side wall of the channelin the bracket 59 a shim 65 is disposed. A'screw 66 threaded inthebracket 59 engages the outer side of the shim and by adjusting thisscrewit will be readily seen that the frame 58 may be securely fixed and heldin its adjusted position upon the bracket 59. As shown in my originalapplication rotationis transmitted to shaft 18 from motor 10 by suitablegearing and a shiftable clutch is employed whereby the belt pulley 5acan be rotated in either direction. While any suitable means might beused for shifting this clutch, I preferably provide for this purpose arod 67 connected to the upper end of said lever and coupled at its-upperend by means of the sleeve'68to a second rod 69 which may be movably orslidably'c onnected at its upper end to a bracket or other relativelyfixed part as indicated at 70.. An axially shiftable rod 71 ismovable'through a supporting lug 72 on the bracket 59 and is pivotallyconnected at one of its ends'as'at 7 3 to the sleeve 68. A suitablehandle 74: is provided upon the other end of said rod. By means of thishandle the rod 71 canbe longitudinally shifted to actuate the clutchshifting rods 67 and 69 and thereby shift-the clutch in the properdirection.

From the foregoing descriptiomthe manner of operation and severaladvantages of the present invention will be readily understood. Thus, inthe event that the driving belt from the overhead counter-shaft shouldbreak or for any other reason it should become nectory results. It willbe understood that the motor driven power supply units may be employedas an auxiliary individual power supply means for use in connection withmany different kinds of machines which are usually operated in seriesfrom a common counter-shaft deriving its power from either a steam, gasor electrically driven engine. Further, it will be apparent that theimproved pewer supply unit is'susceptible of many modifications and maybe exemplified in various other alternative structures than the exampleillustrated herein. Accordingly, the privilege is reserved of resortingto all such legitimate changes in the form, proportion and arrangementof the several cooperating parts as may be fairly embodied within thespirit and scope of the invention asclaimed.

' I claim Belt tightening mechanism including, in combination with ahorizontal driven shaft, coned pulleys on said shaft, a supportingstandard therefor and a driving shaft, a pulley on said driving shaft,and an endless drivingbeltengaged with said pulleys; a supportingbracketfixed to'and projecting laterally from one side of said standard, apulley carriagemounted for sliding movement on said bracket, means foradjusting said carriage towards and from the supporting standard, saidcarriage including a single pair of spaced bearing standards, and a pairof belt guiding pulleys journalled upon and between said standardsarranged within their axes in fixed vertically and laterally spacedrelation to each other and engaged with the respective stretches of thedriving belt whereby said belt stretches are simultaneously and equallytensioned in the adjustment of said carriage.

In testimony that I claim the foregoing as my invention, I have signedmy name hereto.

' HUBERT DALTON.

